I've designed a custom cape for the BBB and the BBBW, when we apply our 5V 
power through P9 the board doesnt' turn on by default.   we have to press 
the power button to get the board to boot.
for our application we cannot have the power button as the interim, we need 
to have it boot when power is applied.

I did a search of the forums and did not find anything with this specific 
topic (having to always press the power button after power is applied.).  I 
did find topics about recommending to apply power through the usb port, but 
that limits the performance.

the BBB and the BBBW both behave this way, although the BBB has a 100k 
pulllup on the power button, I have not found anything on the BBBw.  I did 
find that the PMIC is integrated into the TI processor on the BBBW vs  
external components on the BBB.

does anyone have ideas or a workaround suggestion?

Thanks,
-Matt

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